Nutrition expert，Melanie Rogers，who works with overweight patients in New York，has found that when patients are switched from regular to diet sodas，they don't lose weight at all.“We weren't seeing weight loss necessarily，and that was confusing to us，”said Rogers.

　　So why would diet soda cause weight gain？No one knows for sure yet，but it could be that people think they can eat more if they drink diet sodas，and so over－compensate for the missing calories.

　　A related study found some sweeteners(甜味剂)raised blood sugar levels in some mice.“Data from this and other potential studies suggest that the promotion of diet sodas and artificial sweeteners may be risky.”said Helen P．Hazuda，professor at the University of Texas's school of medicine.“They may be free of calories，but not of consequences.”

　　【语篇解读】 一项新的研究表明，喝低糖汽水非但不能减轻体重，反而会使体重增加。

　　1．People drink diet sodas to ________.　A．enjoy its taste

　　B．stay in fashion

　　C．achieve weight loss

　　D．gain more energy

　　解析　细节理解题。根据第一段中的“People drink diet sodas in the hope that it will help them lose weight...”可知。

　　答案　C

　　2．The new study suggests that drinking diet sodas ________.

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